2nd wave of covid-19 can last up to 100 days: Expert's advisory News Network April 17, 2021 New Delhi, Apr 17: The second wave of coronavirus can last up to 100 days and such waves will keep coming till 70 per cent of the population is vaccinated and herd immunity is achieved, according to an advisory prepared by an expert for Southeast Delhi Police. Aimed at creating awareness among police personnel, the advisory by Dr. Neeraj Kaushik said the new mutated virus has potential to skip immunity and even vaccine. "This is the reason for re-infection and cases among vaccinated people." This mutated virus is so infectious that if one member is affected, the whole family gets infected. It is preying on children too, Dr Kaushik said in the document.